Meaning of “enter” - Learner’s Dictionary

enter

verb us uk /ˈentər/
Knock before you enter.The door opened and someone entered the bedroom.The chapel is on the right as you enter the cathedral.He was not able to enter the US legally.Tanks entered the city before dawn.
PLACE [ I, T ]

A2 to come or go into a place:

The police entered by the back door.
She is accused of entering the country illegally.
INFORMATION [ T ]

B1 to put information into a computer, book, or document:

You have to enter a password to access this information.
COMPETITION [ I, T ]

B1 to take part in a competition, race, or exam, or to arrange for someone else to do this:

Are you going to enter the photography competition?
ORGANIZATION [ T ]

to become a member of a particular organization, or start working in a particular type of job:

She didn't enter the legal profession until she was 40.
PERIOD OF TIME [ T ]

to begin a period of time:

The violence is now entering its third week.

(Definition of “enter” from the Cambridge Learner’s Dictionary © Cambridge University Press)